Mentally beating my lifetime weight struggle

My name is Amanda and for 21 of 31 years I have struggled with weight. I have binged and purged, starved my self, ate so much that my stomached for hours after. I would go to bed at night think about breakfast and wake up thinking about dinner. My weight struggle is in my mind.
When I was 16 I got mono and lost 30 lbs in about a week due to severe dehydration. I ended up in the hospital and when they released me my pants I wore in were so big the fell off. Secretly I was very pleased.
When I returned to school everyone I encountered complimented me on how great I looked. Suddenly guys were interested. I felt like a rockstar.
Of course my overeating habits didn't change and with in a few years all of my weight came back. But one thing remained... It didn't matter how I got skinny as long as I did.
This began my journey of binging and purging mixed with anorexia.
It was full blown when I was 22. I would no longer wake up in the morning thinking about food. I would wake up and test myself how long can I go with out eating today. Usually I would make it to lunch and have a bag of chips. Then dinner would come and of course I would eat a meal and a half because I was starving but I knew it was okay because most of it would come back up. I achieved a weight I wanted 126lbs. My body is not meant to be this lean. My healthy weight is around 140 for my height. I was 5'5", 22 years old, 126 lbs, hourglass figure then I thought I looked amazing. Looking back on those pictures I looked awful.
But this cycle soon ended!
I'm currently working on pulling myself out of the other end of the spectrum. Compulsive overeating. It's a little different this time. I don't eat so much I make myself sick but I do eat if I'm not hungry. Isn't that odd???
I am being seen by a Dr. He has prescribed phentermine (sp) and topamax to curve my appetite. This is helping a lot because it makes me more conscious of my eating.
The best thing his nurse told me who went through a similar weight cycle was this...
You have to stop beating yourself up about your weight. Give yourself room to breathe. Loose 5 lbs and give yourself a break. Then loose another 5lbs, maintain and break. If all you do is try to loose weight nonstop you will get burnt out and continue bad habits from before.
So far I am down 20 lbs and going. Today I am taking a break.